This sentence is not written properly, because there is no need to say "quote" when writing a sentence. Sometimes we say "quote" when talking, or "I am quoting", because the quotes " " are not visible when you are talking. But in writing you can see them, so there is no need to write "quote".
They put a comma to allow a pause in the reading. Perhaps a dash would have been better, but as I said, in writing there is no need to say "quote".
They are saying, in effect:
It'll be kept in the city's tourist areas to "show how classy Dubay is".
Mentioning that it is a quote causes the person reading or listening to understand that this is a quotation from something that somebody said beforehand, or it is a common saying.